Spears was in the Nevada desert for the announcement with more than 1,000 fans. Some dressed in the singer's signature schoolgirl look from her "? Baby One More Time" music video.

The Grammy-winning singer's confirmation about the residency comes months after rumors swirled online. She said in an interview on "GMA" that the show will feature her greatest hits as well as new material.

"I'm definitely ready," she said in a taped interview, adding that she's training five hours each day.

Spears was in a helicopter that hovered above her fans in the desert, who were holding cards that formed a picture of her. The singer stepped off the aircraft and said she was feeling sick. After a second - and live - interview with "GMA," she headed back to the helicopter, barely smiling and offering little more than a wave.